Journal of Research in Medical Sciences1735-199511620061228Assessment of correlation between unprotected coitus and preeclampsia370374ENZohrehYousefiDep. of Obstetrics and Gynecology, Mashhad University of Medical Sciences. ff_vahid@yahoo.comFarzanehJafarnezhadSedighehNasrollahiHabibolahEsmaeeli2007012520070125BACKGROUND: Preeclampsia is a common complication of pregnancy often leading to significant maternal and fetal complications Preeclampsia occurs more frequently in primigravidae and in multigravidae who have a change in paternity. Length of sperm exposure has been proposed to influence the risk of preeclampsia. The aim of this study was to assess the relationship between unprotected coitus and preeclampsia. METHODS: A case-control design was used to compare 91 women with preeclampsia (cases) with 91 matched ones in control group. The age range was from 20 to 35 years. Subjects were selected from mothers referred to Mahdieh and Akbar-Abadi hospitals. Data were gathered by interview method and were analyzed by independent t-test, Mann-Whitney, chi-square, and logistic regression using SPSS software. RESULTS: Women with a short period of co-habitation (